import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(urlPatterns = {"/hello"})//跟在浏览器地址的最后面
public class HelloServlet extends HttpServlet {

   protected void doGet(HttpServletRequest req, HttpServletResponse resp)
           throws ServletException, IOException {
       doPost(req,resp);

   }

   protected void doPost(HttpServletRequest req, HttpServletResponse resp)
           throws ServletException, IOException {
       System.out.println("进入后台");

   }
}
